php实例三之网站浏览量统计

本个实例是通过session统计登陆的次数。

<?php$countfile = "counter.txt";if(($fp=fopen("counter.txt","r+"))==false){    echo "打开文件失败！";}else{    $counter = fgets($fp,1024);    if(empty($_SESSION['temp']))    {        $counter++;        if(($fp=fopen("counter.txt","w"))==false)            echo "打开文件失败！";        else            fputs($fp,$counter);        $_SESSION['temp']=1;     }    fclose($fp);    echo "<p style = 'color:green;'>网站当前访问量：<b>".$counter."</b>次。</p>";}?>